[PATCH 0/3] ArmPlatformPkg, ArmVirtPkg: Add early hello message

[PATCH 0/3] ArmPlatformPkg, ArmVirtPkg: Add early hello message

[Oliver Steffen]

Add the ability to print an early hello message independent of debug
mask to the serial port when the firmware starts. Introduce a PCD entry
to set the message text (ArmPlatformPkg). If the message text is empty
(default) then nothing is printed.

The message is useful for debugging boot problems, especially with
silent firmware builds. It can take some seconds until the first line is
printed when booting the firmware, for example when running ArmVirt in
Qemu.

Use the above in ArmVirtPkg by defining a message text.

These changes have already been proposed by Laszlo Ersek in 2015.
I am reposting because I find this useful.


Example of a VM starting up, AARCH64, Qemu on X64). First line is the
new message. (Timestamp in seconds).

-VM start-
0000.094 | UEFI firmware starting.
00004.06 | BdsDxe: failed to load Boot0001 "UEFI Misc Device" from VenHw(93E34C7E-B50E-11DF-9223-2443DFD72085,00): Not Found
00004.08 | BdsDxe: loading Boot0002 "UEFI Misc Device 2" from PciRoot(0x0)/Pci(0x2,0x0)
00004.08 | BdsDxe: starting Boot0002 "UEFI Misc Device 2" from PciRoot(0x0)/Pci(0x2,0x0)
00004.11 | System BootOrder not found.  Initializing defaults.
00004.11 | Creating boot entry "Boot0005" with label "Red Hat Enterprise Linux" for file "\EFI\redhat\shimaa64.efi"
00004.15 |
00008.39 | EFI stub: Booting Linux Kernel...
[...]


PR: https://github.com/tianocore/edk2/pull/3140

Signed-off-by: Oliver Steffen <osteffen@redhat.com>

# Everything here is editable! You can modify the patch name, author,
# date, commit message, and the diff (if --diff was given).
# Lines starting with '#' will be ignored, and an empty message
# aborts the edit.

Laszlo Ersek (3):
  ArmPlatformPkg: introduce fixed PCD for early hello message
  ArmPlatformPkg: PrePeiCore: write early hello message to the serial
    port
  ArmVirtPkg: set early hello message

 ArmPlatformPkg/ArmPlatformPkg.dec               | 7 +++++++
 ArmVirtPkg/ArmVirtQemu.dsc                      | 1 +
 ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
 ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
 ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
 ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 5 +++++
 ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 5 +++++
 7 files changed, 23 insertions(+)

-- 
2.37.1

[PATCH 1/3] ArmPlatformPkg: introduce fixed PCD for early hello message

[Oliver Steffen]

From: Laszlo Ersek <lersek@redhat.com>

Add a PCD for defining a hello message that gets printed to the serial port
very early in the boot process, regardless of debug masks. This is useful
for debugging boot problems (especially in virtual machines) and informs
interactive users that the firmware is running.

If a platform doesn't want this feature, it should stick with the default
empty string.

Singed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Oliver Steffen <osteffen@redhat.com>
---
 ArmPlatformPkg/ArmPlatformPkg.dec | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ArmPlatformPkg/ArmPlatformPkg.dec b/ArmPlatformPkg/ArmPlatformPkg.dec
index dd6e78f62aa1..ac726417cbe7 100644
--- a/ArmPlatformPkg/ArmPlatformPkg.dec
+++ b/ArmPlatformPkg/ArmPlatformPkg.dec
@@ -122,6 +122,13 @@ [PcdsFixedAtBuild.common]
   ## If set, this will swap settings for HDLCD RED_SELECT and BLUE_SELECT registers
   gArmPlatformTokenSpaceGuid.PcdArmHdLcdSwapBlueRedSelect|FALSE|BOOLEAN|0x00000045
 
+  #
+  # Early hello message (ASCII string), printed to the serial port.
+  # If set to the empty string, nothing is printed.
+  # Otherwise, a trailing CRLF should be specified explicitly.
+  #
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage|""|VOID*|0x00000100
+
 [PcdsFixedAtBuild.common,PcdsDynamic.common]
   ## PL031 RealTimeClock
   gArmPlatformTokenSpaceGuid.PcdPL031RtcBase|0x0|UINT32|0x00000024
-- 
2.37.1

[PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

[Oliver Steffen]

From: Laszlo Ersek <lersek@redhat.com>

Print the early hello message to the serial port.

The FixedPcdGetSize() macro expands to an integer constant, therefore an
optimizing compiler can eliminate the new code, if the platform DSC
doesn't override the empty string (size=1) default of
PcdEarlyHelloMessage.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Oliver Steffen <osteffen@redhat.com>
---
 ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
 ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
 ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
 ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 7 +++++++
 ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 7 +++++++
 5 files changed, 19 insertions(+)

diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
index a5b4722459d1..ea7b220bc831 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
@@ -66,6 +66,8 @@ [FixedPcd]
   gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
   gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
 
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
+
   gArmTokenSpaceGuid.PcdGicDistributorBase
   gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
   gArmTokenSpaceGuid.PcdGicSgiIntId
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
index 466a2b01c384..29fb8737cb2f 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
@@ -64,4 +64,6 @@ [FixedPcd]
   gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
   gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
 
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
+
   gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
index 0345dd7bdd2a..ae8302becda2 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
@@ -16,6 +16,7 @@
 #include <Library/DebugLib.h>
 #include <Library/IoLib.h>
 #include <Library/PcdLib.h>
+#include <Library/SerialPortLib.h>
 
 #include <PiPei.h>
 #include <Ppi/TemporaryRamSupport.h>
diff --git a/ArmPlatformPkg/PrePeiCore/MainMPCore.c b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
index b5d0d3a6442f..21c9d5f6da8f 100644
--- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
+++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
@@ -116,6 +116,13 @@ PrimaryMain (
   UINTN                   TemporaryRamBase;
   UINTN                   TemporaryRamSize;
 
+  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
+    SerialPortWrite (
+      FixedPcdGetPtr (PcdEarlyHelloMessage),
+      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
+      );
+  }
+
   CreatePpiList (&PpiListSize, &PpiList);
 
   // Enable the GIC Distributor
diff --git a/ArmPlatformPkg/PrePeiCore/MainUniCore.c b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
index 1c2580eb923b..37560540e14f 100644
--- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
+++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
@@ -29,6 +29,13 @@ PrimaryMain (
   UINTN                   TemporaryRamBase;
   UINTN                   TemporaryRamSize;
 
+  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
+    SerialPortWrite (
+      FixedPcdGetPtr (PcdEarlyHelloMessage),
+      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
+      );
+  }
+
   CreatePpiList (&PpiListSize, &PpiList);
 
   // Adjust the Temporary Ram as the new Ppi List (Common + Platform Ppi Lists) is created at
-- 
2.37.1

[PATCH 3/3] ArmVirtPkg: set early hello message

[Oliver Steffen]

From: Laszlo Ersek <lersek@redhat.com>

Set the text for the early hello message in ArmVirtPkg. This prints a
friendly banner on QEMU, regardless of debug mask settings.

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Oliver Steffen <osteffen@redhat.com>
---
 ArmVirtPkg/ArmVirtQemu.dsc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc
index 9369a88858fd..eaa784c1573a 100644
--- a/ArmVirtPkg/ArmVirtQemu.dsc
+++ b/ArmVirtPkg/ArmVirtQemu.dsc
@@ -135,6 +135,7 @@ [PcdsFeatureFlag.common]
   gArmVirtTokenSpaceGuid.PcdTpm2SupportEnabled|$(TPM2_ENABLE)
 
 [PcdsFixedAtBuild.common]
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage|"UEFI firmware starting.\r\n"
 !if $(ARCH) == AARCH64
   gArmTokenSpaceGuid.PcdVFPEnabled|1
 !endif
-- 
2.37.1

Re: [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

[Sami Mujawar]

Hi Oliver,

There is a patch for review at https://edk2.groups.io/g/devel/message/88884 which prints the firmware version string. I believe with Ard's comments addressed that patch can be merged.
Would that patch solve your purpose to print an early message for debug purpose?

Regards,

Sami Mujawar

On 26/07/2022, 08:29, "Oliver Steffen" <osteffen@redhat.com> wrote:

    From: Laszlo Ersek <lersek@redhat.com>

    Print the early hello message to the serial port.

    The FixedPcdGetSize() macro expands to an integer constant, therefore an
    optimizing compiler can eliminate the new code, if the platform DSC
    doesn't override the empty string (size=1) default of
    PcdEarlyHelloMessage.

    Signed-off-by: Laszlo Ersek <lersek@redhat.com>
    Signed-off-by: Oliver Steffen <osteffen@redhat.com>
    ---
     ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
     ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
     ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
     ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 7 +++++++
     ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 7 +++++++
     5 files changed, 19 insertions(+)

    diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
    index a5b4722459d1..ea7b220bc831 100644
    --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
    +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
    @@ -66,6 +66,8 @@ [FixedPcd]
       gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
       gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize

    +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
    +
       gArmTokenSpaceGuid.PcdGicDistributorBase
       gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
       gArmTokenSpaceGuid.PcdGicSgiIntId
    diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
    index 466a2b01c384..29fb8737cb2f 100644
    --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
    +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
    @@ -64,4 +64,6 @@ [FixedPcd]
       gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
       gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize

    +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
    +
       gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
    diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
    index 0345dd7bdd2a..ae8302becda2 100644
    --- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
    +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
    @@ -16,6 +16,7 @@
     #include <Library/DebugLib.h>
     #include <Library/IoLib.h>
     #include <Library/PcdLib.h>
    +#include <Library/SerialPortLib.h>

     #include <PiPei.h>
     #include <Ppi/TemporaryRamSupport.h>
    diff --git a/ArmPlatformPkg/PrePeiCore/MainMPCore.c b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
    index b5d0d3a6442f..21c9d5f6da8f 100644
    --- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
    +++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
    @@ -116,6 +116,13 @@ PrimaryMain (
       UINTN                   TemporaryRamBase;
       UINTN                   TemporaryRamSize;

    +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
    +    SerialPortWrite (
    +      FixedPcdGetPtr (PcdEarlyHelloMessage),
    +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
    +      );
    +  }
    +
       CreatePpiList (&PpiListSize, &PpiList);

       // Enable the GIC Distributor
    diff --git a/ArmPlatformPkg/PrePeiCore/MainUniCore.c b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
    index 1c2580eb923b..37560540e14f 100644
    --- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
    +++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
    @@ -29,6 +29,13 @@ PrimaryMain (
       UINTN                   TemporaryRamBase;
       UINTN                   TemporaryRamSize;

    +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
    +    SerialPortWrite (
    +      FixedPcdGetPtr (PcdEarlyHelloMessage),
    +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
    +      );
    +  }
    +
       CreatePpiList (&PpiListSize, &PpiList);

       // Adjust the Temporary Ram as the new Ppi List (Common + Platform Ppi Lists) is created at
    --
    2.37.1


IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

Re: [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

[Oliver Steffen]

[-- Attachment #1: Type: text/plain, Size: 5575 bytes --]

Hi Sami,

Thank you for pointing to that patch. It pretty much does the same thing
and I would be OK with using it instead of these changes here. Except
that the message only shows up in debug mode and seems to depend on the
debug mask. It would be nice if it would show up all the time.

We are building ArmVirt in debug, but with
DEBUG_PRINT_ERROR_LEVEL=0x80000000, aka a "silent" debug build, and need
the message there too.

What was proposed in this series prints the message independently of the
debug mask.

Regards,
 Oliver

On Tue, Jul 26, 2022 at 12:42 PM Sami Mujawar <Sami.Mujawar@arm.com> wrote:

> Hi Oliver,
>
> There is a patch for review at
> https://edk2.groups.io/g/devel/message/88884 which prints the firmware
> version string. I believe with Ard's comments addressed that patch can be
> merged.
> Would that patch solve your purpose to print an early message for debug
> purpose?
>
> Regards,
>
> Sami Mujawar
>
> On 26/07/2022, 08:29, "Oliver Steffen" <osteffen@redhat.com> wrote:
>
>     From: Laszlo Ersek <lersek@redhat.com>
>
>     Print the early hello message to the serial port.
>
>     The FixedPcdGetSize() macro expands to an integer constant, therefore
> an
>     optimizing compiler can eliminate the new code, if the platform DSC
>     doesn't override the empty string (size=1) default of
>     PcdEarlyHelloMessage.
>
>     Signed-off-by: Laszlo Ersek <lersek@redhat.com>
>     Signed-off-by: Oliver Steffen <osteffen@redhat.com>
>     ---
>      ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
>      ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
>      ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
>      ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 7 +++++++
>      ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 7 +++++++
>      5 files changed, 19 insertions(+)
>
>     diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
> b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
>     index a5b4722459d1..ea7b220bc831 100644
>     --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
>     +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
>     @@ -66,6 +66,8 @@ [FixedPcd]
>        gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
>        gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
>
>     +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
>     +
>        gArmTokenSpaceGuid.PcdGicDistributorBase
>        gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
>        gArmTokenSpaceGuid.PcdGicSgiIntId
>     diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
> b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
>     index 466a2b01c384..29fb8737cb2f 100644
>     --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
>     +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
>     @@ -64,4 +64,6 @@ [FixedPcd]
>        gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
>        gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
>
>     +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
>     +
>        gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
>     diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
> b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
>     index 0345dd7bdd2a..ae8302becda2 100644
>     --- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
>     +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
>     @@ -16,6 +16,7 @@
>      #include <Library/DebugLib.h>
>      #include <Library/IoLib.h>
>      #include <Library/PcdLib.h>
>     +#include <Library/SerialPortLib.h>
>
>      #include <PiPei.h>
>      #include <Ppi/TemporaryRamSupport.h>
>     diff --git a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
> b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
>     index b5d0d3a6442f..21c9d5f6da8f 100644
>     --- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
>     +++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
>     @@ -116,6 +116,13 @@ PrimaryMain (
>        UINTN                   TemporaryRamBase;
>        UINTN                   TemporaryRamSize;
>
>     +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
>     +    SerialPortWrite (
>     +      FixedPcdGetPtr (PcdEarlyHelloMessage),
>     +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
>     +      );
>     +  }
>     +
>        CreatePpiList (&PpiListSize, &PpiList);
>
>        // Enable the GIC Distributor
>     diff --git a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
> b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
>     index 1c2580eb923b..37560540e14f 100644
>     --- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
>     +++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
>     @@ -29,6 +29,13 @@ PrimaryMain (
>        UINTN                   TemporaryRamBase;
>        UINTN                   TemporaryRamSize;
>
>     +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
>     +    SerialPortWrite (
>     +      FixedPcdGetPtr (PcdEarlyHelloMessage),
>     +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
>     +      );
>     +  }
>     +
>        CreatePpiList (&PpiListSize, &PpiList);
>
>        // Adjust the Temporary Ram as the new Ppi List (Common + Platform
> Ppi Lists) is created at
>     --
>     2.37.1
>
>
> IMPORTANT NOTICE: The contents of this email and any attachments are
> confidential and may also be privileged. If you are not the intended
> recipient, please notify the sender immediately and do not disclose the
> contents to any other person, use it for any purpose, or store or copy the
> information in any medium. Thank you.
>

[-- Attachment #2: Type: text/html, Size: 6865 bytes --]

Re: [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

[Sami Mujawar]

[-- Attachment #1: Type: text/plain, Size: 6796 bytes --]

Hi Oliver,

Both your and Rebecca’s patches are using SerialPortWrite() which should work regardless of the debug print level and for release builds as well.
Rebecca’s patch additionally initialises the serial port which is required if the UART has not been setup by any previous firmware.
I believe Qemu might handoff with the UART initialised, therefore you might not see the difference. However, this would be required for some hardware platforms.

I do not have a setup with Qemu ready to try. Is it possible for you to apply Rebecca’s patch and check, please?
Alternatively, I will prepare a setup tomorrow to confirm.

Regards,

Sami Mujawar

From: Oliver Steffen <osteffen@redhat.com>
Date: Tuesday, 26 July 2022 at 16:50
To: Sami Mujawar <Sami.Mujawar@arm.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>, Rebecca Cran <rebecca@bsdio.com>, "quic_rcran@quicinc.com" <quic_rcran@quicinc.com>, Ard Biesheuvel <ardb+tianocore@kernel.org>, Chasel Chiu <chasel.chiu@intel.com>, Gerd Hoffmann <kraxel@redhat.com>, Leif Lindholm <quic_llindhol@quicinc.com>, Nate DeSimone <nathaniel.l.desimone@intel.com>, Star Zeng <star.zeng@intel.com>, Andrew Fish <afish@apple.com>, Laszlo Ersek <lersek@redhat.com>
Subject: Re: [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

Hi Sami,

Thank you for pointing to that patch. It pretty much does the same thing
and I would be OK with using it instead of these changes here. Except
that the message only shows up in debug mode and seems to depend on the
debug mask. It would be nice if it would show up all the time.

We are building ArmVirt in debug, but with
DEBUG_PRINT_ERROR_LEVEL=0x80000000, aka a "silent" debug build, and need
the message there too.

What was proposed in this series prints the message independently of the
debug mask.

Regards,
 Oliver

On Tue, Jul 26, 2022 at 12:42 PM Sami Mujawar <Sami.Mujawar@arm.com<mailto:Sami.Mujawar@arm.com>> wrote:
Hi Oliver,

There is a patch for review at https://edk2.groups.io/g/devel/message/88884 which prints the firmware version string. I believe with Ard's comments addressed that patch can be merged.
Would that patch solve your purpose to print an early message for debug purpose?

Regards,

Sami Mujawar

On 26/07/2022, 08:29, "Oliver Steffen" <osteffen@redhat.com<mailto:osteffen@redhat.com>> wrote:

    From: Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com>>

    Print the early hello message to the serial port.

    The FixedPcdGetSize() macro expands to an integer constant, therefore an
    optimizing compiler can eliminate the new code, if the platform DSC
    doesn't override the empty string (size=1) default of
    PcdEarlyHelloMessage.

    Signed-off-by: Laszlo Ersek <lersek@redhat.com<mailto:lersek@redhat.com>>
    Signed-off-by: Oliver Steffen <osteffen@redhat.com<mailto:osteffen@redhat.com>>
    ---
     ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
     ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
     ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
     ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 7 +++++++
     ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 7 +++++++
     5 files changed, 19 insertions(+)

    diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
    index a5b4722459d1..ea7b220bc831 100644
    --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
    +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
    @@ -66,6 +66,8 @@ [FixedPcd]
       gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
       gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize

    +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
    +
       gArmTokenSpaceGuid.PcdGicDistributorBase
       gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
       gArmTokenSpaceGuid.PcdGicSgiIntId
    diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
    index 466a2b01c384..29fb8737cb2f 100644
    --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
    +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
    @@ -64,4 +64,6 @@ [FixedPcd]
       gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
       gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize

    +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
    +
       gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
    diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
    index 0345dd7bdd2a..ae8302becda2 100644
    --- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
    +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
    @@ -16,6 +16,7 @@
     #include <Library/DebugLib.h>
     #include <Library/IoLib.h>
     #include <Library/PcdLib.h>
    +#include <Library/SerialPortLib.h>

     #include <PiPei.h>
     #include <Ppi/TemporaryRamSupport.h>
    diff --git a/ArmPlatformPkg/PrePeiCore/MainMPCore.c b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
    index b5d0d3a6442f..21c9d5f6da8f 100644
    --- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
    +++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
    @@ -116,6 +116,13 @@ PrimaryMain (
       UINTN                   TemporaryRamBase;
       UINTN                   TemporaryRamSize;

    +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
    +    SerialPortWrite (
    +      FixedPcdGetPtr (PcdEarlyHelloMessage),
    +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
    +      );
    +  }
    +
       CreatePpiList (&PpiListSize, &PpiList);

       // Enable the GIC Distributor
    diff --git a/ArmPlatformPkg/PrePeiCore/MainUniCore.c b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
    index 1c2580eb923b..37560540e14f 100644
    --- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
    +++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
    @@ -29,6 +29,13 @@ PrimaryMain (
       UINTN                   TemporaryRamBase;
       UINTN                   TemporaryRamSize;

    +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
    +    SerialPortWrite (
    +      FixedPcdGetPtr (PcdEarlyHelloMessage),
    +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
    +      );
    +  }
    +
       CreatePpiList (&PpiListSize, &PpiList);

       // Adjust the Temporary Ram as the new Ppi List (Common + Platform Ppi Lists) is created at
    --
    2.37.1


IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

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Re: [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

[Oliver Steffen]

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Hi everyone,

I checked Rebecca's patch with my Qemu use case.
All fine - we can use that patch instead of the series I posted here.
Even better, because it prints the version information.

Thanks!

Regards,
 Oliver

On Tue, Jul 26, 2022 at 6:22 PM Sami Mujawar <Sami.Mujawar@arm.com> wrote:

> Hi Oliver,
>
>
>
> Both your and Rebecca’s patches are using SerialPortWrite() which should
> work regardless of the debug print level and for release builds as well.
>
> Rebecca’s patch additionally initialises the serial port which is required
> if the UART has not been setup by any previous firmware.
>
> I believe Qemu might handoff with the UART initialised, therefore you
> might not see the difference. However, this would be required for some
> hardware platforms.
>
>
>
> I do not have a setup with Qemu ready to try. Is it possible for you to
> apply Rebecca’s patch and check, please?
>
> Alternatively, I will prepare a setup tomorrow to confirm.
>
>
>
> Regards,
>
>
>
> Sami Mujawar
>
>
>
> *From: *Oliver Steffen <osteffen@redhat.com>
> *Date: *Tuesday, 26 July 2022 at 16:50
> *To: *Sami Mujawar <Sami.Mujawar@arm.com>
> *Cc: *"devel@edk2.groups.io" <devel@edk2.groups.io>, Rebecca Cran <
> rebecca@bsdio.com>, "quic_rcran@quicinc.com" <quic_rcran@quicinc.com>,
> Ard Biesheuvel <ardb+tianocore@kernel.org>, Chasel Chiu <
> chasel.chiu@intel.com>, Gerd Hoffmann <kraxel@redhat.com>, Leif Lindholm <
> quic_llindhol@quicinc.com>, Nate DeSimone <nathaniel.l.desimone@intel.com>,
> Star Zeng <star.zeng@intel.com>, Andrew Fish <afish@apple.com>, Laszlo
> Ersek <lersek@redhat.com>
> *Subject: *Re: [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello
> message to the serial port
>
>
>
> Hi Sami,
>
> Thank you for pointing to that patch. It pretty much does the same thing
> and I would be OK with using it instead of these changes here. Except
> that the message only shows up in debug mode and seems to depend on the
> debug mask. It would be nice if it would show up all the time.
>
> We are building ArmVirt in debug, but with
> DEBUG_PRINT_ERROR_LEVEL=0x80000000, aka a "silent" debug build, and need
> the message there too.
>
> What was proposed in this series prints the message independently of the
> debug mask.
>
>
> Regards,
>  Oliver
>
>
>
> On Tue, Jul 26, 2022 at 12:42 PM Sami Mujawar <Sami.Mujawar@arm.com>
> wrote:
>
> Hi Oliver,
>
> There is a patch for review at
> https://edk2.groups.io/g/devel/message/88884 which prints the firmware
> version string. I believe with Ard's comments addressed that patch can be
> merged.
> Would that patch solve your purpose to print an early message for debug
> purpose?
>
> Regards,
>
> Sami Mujawar
>
> On 26/07/2022, 08:29, "Oliver Steffen" <osteffen@redhat.com> wrote:
>
>     From: Laszlo Ersek <lersek@redhat.com>
>
>     Print the early hello message to the serial port.
>
>     The FixedPcdGetSize() macro expands to an integer constant, therefore
> an
>     optimizing compiler can eliminate the new code, if the platform DSC
>     doesn't override the empty string (size=1) default of
>     PcdEarlyHelloMessage.
>
>     Signed-off-by: Laszlo Ersek <lersek@redhat.com>
>     Signed-off-by: Oliver Steffen <osteffen@redhat.com>
>     ---
>      ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
>      ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
>      ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
>      ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 7 +++++++
>      ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 7 +++++++
>      5 files changed, 19 insertions(+)
>
>     diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
> b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
>     index a5b4722459d1..ea7b220bc831 100644
>     --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
>     +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
>     @@ -66,6 +66,8 @@ [FixedPcd]
>        gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
>        gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
>
>     +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
>     +
>        gArmTokenSpaceGuid.PcdGicDistributorBase
>        gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
>        gArmTokenSpaceGuid.PcdGicSgiIntId
>     diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
> b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
>     index 466a2b01c384..29fb8737cb2f 100644
>     --- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
>     +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
>     @@ -64,4 +64,6 @@ [FixedPcd]
>        gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
>        gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
>
>     +  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
>     +
>        gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
>     diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
> b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
>     index 0345dd7bdd2a..ae8302becda2 100644
>     --- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
>     +++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
>     @@ -16,6 +16,7 @@
>      #include <Library/DebugLib.h>
>      #include <Library/IoLib.h>
>      #include <Library/PcdLib.h>
>     +#include <Library/SerialPortLib.h>
>
>      #include <PiPei.h>
>      #include <Ppi/TemporaryRamSupport.h>
>     diff --git a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
> b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
>     index b5d0d3a6442f..21c9d5f6da8f 100644
>     --- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
>     +++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
>     @@ -116,6 +116,13 @@ PrimaryMain (
>        UINTN                   TemporaryRamBase;
>        UINTN                   TemporaryRamSize;
>
>     +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
>     +    SerialPortWrite (
>     +      FixedPcdGetPtr (PcdEarlyHelloMessage),
>     +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
>     +      );
>     +  }
>     +
>        CreatePpiList (&PpiListSize, &PpiList);
>
>        // Enable the GIC Distributor
>     diff --git a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
> b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
>     index 1c2580eb923b..37560540e14f 100644
>     --- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
>     +++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
>     @@ -29,6 +29,13 @@ PrimaryMain (
>        UINTN                   TemporaryRamBase;
>        UINTN                   TemporaryRamSize;
>
>     +  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
>     +    SerialPortWrite (
>     +      FixedPcdGetPtr (PcdEarlyHelloMessage),
>     +      FixedPcdGetSize (PcdEarlyHelloMessage) - 1
>     +      );
>     +  }
>     +
>        CreatePpiList (&PpiListSize, &PpiList);
>
>        // Adjust the Temporary Ram as the new Ppi List (Common + Platform
> Ppi Lists) is created at
>     --
>     2.37.1
>
>
> IMPORTANT NOTICE: The contents of this email and any attachments are
> confidential and may also be privileged. If you are not the intended
> recipient, please notify the sender immediately and do not disclose the
> contents to any other person, use it for any purpose, or store or copy the
> information in any medium. Thank you.
>
>

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Re: [edk2-devel] [PATCH 2/3] ArmPlatformPkg: PrePeiCore: write early hello message to the serial port

[Ard Biesheuvel]

On Thu, 28 Jul 2022 at 11:53, Oliver Steffen <osteffen@redhat.com> wrote:
>
> Hi everyone,
>
> I checked Rebecca's patch with my Qemu use case.
> All fine - we can use that patch instead of the series I posted here.
> Even better, because it prints the version information.
>
> Thanks!
>

Thanks for confirming.